Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /users/quirl/www/filemanager/spark/protected/humhub/modules/comment/migrations/m200715_184207_commentIndex.php:8 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/comment/migrations/m200715_184207_commentIndex.php on line 8